Yellowstone County Power Outage History
2020–2025 · Montana
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 6, 2024 | 32 hrs | 14,848 (19%) | Thunderstorm Wind |
| Jul 25, 2022 | 18 hrs | 7,375 (9%) | Hail |
| Apr 17, 2025 | 18 hrs | 7,083 (9%) | Winter Storm |
| Feb 7, 2024 | 7 hrs | 6,265 (8%) | Unnamed event |
| Mar 2, 2024 | 4 hrs | 6,261 (8%) | Unnamed event |
Over the 6 years from 2020 to 2025, Yellowstone County recorded 308 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Yellowstone County started August 6, 2024 (Thunderstorm Wind), lasting 32 hours and leaving up to 14,848 customers without power (19% of the county) at its peak.
July has historically been the worst month for outages in Yellowstone County, with 47 events recorded during that month across the dataset.
Based on this history, Yellowstone County earns a Reliability Grade of A, placing it in the 89th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Yellowstone County's outage profile
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Similar counties in Montana
Counties with the closest reliability grade and national percentile to Yellowstone County.
| County | Grade | National percentile |
|---|---|---|
| Silver Bow County | A | 89th |
| Custer County | A | 87th |
| Stillwater County | A | 90th |
| Gallatin County | A | 92nd |
| Beaverhead County | A | 84th |
FAQ
How often does power go out in Yellowstone County?
Between 2020 and 2025, Yellowstone County recorded 308 outage events, averaging 2.7 hours each.
What is Yellowstone County's reliability grade?
Yellowstone County has a Reliability Grade of A, in the 89th national percentile.
What was the worst power outage in Yellowstone County?
The worst outage on record started August 6, 2024 (Thunderstorm Wind), lasting 32 hours and affecting up to 14,848 customers.